Comprehensive Income (Changes in AOCL) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of beginning of period	$ (97.2)
Other comprehensive income (loss) before reclassifications	10.7
Amounts reclassified from AOCL	(6.6)
Net other comprehensive income (loss)	4.1
Balance as of end of period	(93.1)
Gains (Losses) on Cash Flow Hedges [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of beginning of period	8.2
Other comprehensive income (loss) before reclassifications	16.3
Amounts reclassified from AOCL	(10.4)
Net other comprehensive income (loss)	5.9
Balance as of end of period	14.1
Defined Benefit Pension Plan Items [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of beginning of period	(82.7)
Other comprehensive income (loss) before reclassifications	(7.2)
Amounts reclassified from AOCL	3.8
Net other comprehensive income (loss)	(3.4)
Balance as of end of period	(86.1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of beginning of period	(21.5)
Other comprehensive income (loss) before reclassifications	1.6
Amounts reclassified from AOCL	0.0
Net other comprehensive income (loss)	1.6
Balance as of end of period	(19.9)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of beginning of period	(1.2)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from AOCL	0.0
Net other comprehensive income (loss)	0.0
Balance as of end of period	$ (1.2)