|
Derivative Instruments and Hedging Activities (Forward Starting Interest Rate Swaps) (Details) (USD $)
In Millions, unless otherwise specified
|
12 Months Ended |
|
|
Dec. 31, 2014
|
Mar. 31, 2015
|
| 2.450% senior notes due 2015 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
2.45% |
| 1.900% senior notes due 2017 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
1.90% |
| 3.950% senior notes due 2020 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
3.95% |
| 3.250% senior notes due 2022 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
3.25% |
| 4.000% senior notes due 2023 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
4.00% |
| Designated as hedging instruments |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
$ 1,250.0 |
|
| Designated as hedging instruments | Forward starting interest rate swap maturing in year ten |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
750.0 |
|
| Remaining maturity |
10 years |
|
| Designated as hedging instruments | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
2,700.0 |
3,400.0 |
| Senior notes | 2.450% senior notes due 2015 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
2.45% |
| Senior notes | 1.900% senior notes due 2017 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
1.90% |
| Senior notes | 2.300% senior notes due 2018 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
2.30% |
| Senior notes | 2.250% senior notes due 2019 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
2.25% |
| Senior notes | 3.950% senior notes due 2020 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
3.95% |
| Senior notes | 3.250% senior notes due 2022 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
3.25% |
| Senior notes | 4.000% senior notes due 2023 |
|
|
| Derivative [Line Items] |
|
|
| Interest rate (as a percentage) |
|
4.00% |
| Senior notes | Designated as hedging instruments | 2.450% senior notes due 2015 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
300.0 |
300.0 |
| Senior notes | Designated as hedging instruments | 1.900% senior notes due 2017 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
300.0 |
300.0 |
| Senior notes | Designated as hedging instruments | 2.300% senior notes due 2018 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
200.0 |
200.0 |
| Senior notes | Designated as hedging instruments | 2.250% senior notes due 2019 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
500.0 |
500.0 |
| Senior notes | Designated as hedging instruments | 3.950% senior notes due 2020 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
500.0 |
500.0 |
| Senior notes | Designated as hedging instruments | 3.250% senior notes due 2022 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
750.0 |
1,000.0 |
| Senior notes | Designated as hedging instruments | 4.000% senior notes due 2023 | Interest rate swap contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amount |
$ 150.0 |
600.0 |