Debt - Additional Information (Details) - USD ($)
$ in Millions |
|
3 Months Ended |
9 Months Ended |
|
Aug. 29, 2016 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Long-term debt |
|
$ 2,664.6
|
|
$ 2,664.6
|
|
$ 2,309.2
|
| Cash payments paid for interest |
|
|
|
59.5
|
$ 58.6
|
|
| Amortization of treasury lock settlements |
|
|
$ 1.4
|
4.2
|
4.2
|
|
| Amortization of deferred financing costs |
|
0.5
|
$ 0.5
|
$ 1.4
|
1.3
|
|
| Five Year Credit Agreement |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt instrument, term |
5 years
|
|
|
|
|
|
| Unsecured Debt | Five-Year Term Loan, due August 2021 |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt instrument, face amount |
$ 385.0
|
|
|
|
|
|
| Debt instrument, term |
5 years
|
|
|
5 years
|
|
|
| Long-term debt |
|
385.0
|
|
$ 385.0
|
|
0.0
|
| Unsecured Debt | Seven-Year Term Loan, due October 2020 |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt instrument, face amount |
$ 650.0
|
|
|
|
|
|
| Debt instrument, term |
7 years
|
|
|
7 years
|
|
|
| Repayment of debt |
|
|
|
$ 4.9
|
4.9
|
|
| Long-term debt |
$ 633.7
|
632.1
|
|
$ 632.1
|
|
637.0
|
| Unsecured Debt | Five-Year Term Loan, due October 2018 |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt instrument, term |
|
|
|
5 years
|
|
|
| Repayment of debt |
|
|
|
$ 25.0
|
$ 25.0
|
|
| Long-term debt |
|
0.0
|
|
0.0
|
|
25.0
|
| Line of Credit | Revolving Credit Facility, due August 2021 |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Debt instrument, face amount |
$ 350.0
|
|
|
|
|
|
| Letters of credit outstanding |
|
25.0
|
|
25.0
|
|
|
| Long-term debt |
|
0.0
|
|
0.0
|
|
$ 0.0
|
| Senior Notes | Fixed-Rate Senior Notes |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Book value of fixed rate debt |
|
1,647.5
|
|
1,647.5
|
|
|
| Long-term debt (fixed-rate debt), fair value |
|
1,767.1
|
|
1,767.1
|
|
|
| Term Loan | Variable-Rate Term Loans |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Book value of variable rate debt |
|
$ 1,017.1
|
|
$ 1,017.1
|
|
|