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Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance $ 8,488.8 $ 8,120.9 $ 7,929.5
Other comprehensive income (loss) before reclassifications (5.8) (20.4) (32.7)
Amounts reclassified from accumulated other comprehensive income (loss) 3.6 5.8 1.0
Other comprehensive loss, net of tax (2.2) (14.6) (31.7)
Balance 8,979.7 8,488.8 8,120.9
Cumulative Effect, Period of Adoption, Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance     0.0
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (12.4) 2.2 30.8
Balance (14.6) (12.4) 2.2
Total | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance   3.1 3.1
Balance     3.1
Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (30.4) (13.7) 16.1
Other comprehensive income (loss) before reclassifications 0.0 (22.5) (30.2)
Amounts reclassified from accumulated other comprehensive income (loss) 4.6 5.8 1.0
Other comprehensive loss, net of tax 4.6 (16.7) (29.2)
Balance (25.8) (30.4) (13.7)
Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance   (0.6)  
Balance     (0.6)
Defined Benefit Pension Plan      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance 18.0 15.9 14.7
Other comprehensive income (loss) before reclassifications (5.8) 2.1 (2.5)
Amounts reclassified from accumulated other comprehensive income (loss) (1.0) 0.0 0.0
Other comprehensive loss, net of tax (6.8) 2.1 (2.5)
Balance 11.2 18.0 15.9
Defined Benefit Pension Plan | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance   3.7  
Balance     3.7
AOCI Including Portion Attributable to Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (12.4) 2.2 30.8
Balance $ (14.6) $ (12.4) $ 2.2