Stockholders' Equity and Equity Instruments, Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income [Line Items]    
Beginning Balance $ 34.5 [1] $ 57.6 [1]
Other comprehensive income (loss) before reclassifications (14.9) [1],[2] (13.0) [1],[2]
Amounts reclassified from accumulated other comprehensive income (0.1) [1] 0.6 [1]
Net current period other comprehensive income (loss) (15.0) [1] (12.4) [1]
Ending Balance 19.5 [1] 45.2 [1]
Gains and (Losses) on Cash Flow Hedges [Member]
    
Accumulated Other Comprehensive Income [Line Items]    
Beginning Balance 0.3 [1] (0.7) [1]
Other comprehensive income (loss) before reclassifications 0.6 [1],[2] 0.4 [1],[2]
Amounts reclassified from accumulated other comprehensive income (0.4) [1] 0.3 [1]
Net current period other comprehensive income (loss) 0.2 [1] 0.7 [1]
Ending Balance 0.5 [1] 0 [1]
Defined Benefit Pension [Member]
    
Accumulated Other Comprehensive Income [Line Items]    
Beginning Balance (9.3) [1] (9.6) [1]
Other comprehensive income (loss) before reclassifications 0 [1],[2] 0 [1],[2]
Amounts reclassified from accumulated other comprehensive income 0.3 [1] 0.3 [1]
Net current period other comprehensive income (loss) 0.3 [1] 0.3 [1]
Ending Balance (9.0) [1] (9.3) [1]
Foreign Currency [Member]
    
Accumulated Other Comprehensive Income [Line Items]    
Beginning Balance 43.5 [1] 67.9 [1]
Other comprehensive income (loss) before reclassifications (15.5) [1],[2] (13.4) [1],[2]
Amounts reclassified from accumulated other comprehensive income 0 [1] 0 [1]
Net current period other comprehensive income (loss) (15.5) [1] (13.4) [1]
Ending Balance $ 28.0 [1] $ 54.5 [1]
[1] With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.
[2] The Company recorded foreign exchange losses of approximately $8.3 million and $4.9 million in the first quarters of 2014 and 2013, respectively, in accumulated other comprehensive income related to intercompany notes which were deemed to be of long-term investment nature.