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Income Taxes - Pre-tax Income and Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Continuing operations      
U.S. domestic $ 395.2 $ 319.0 $ 393.8
Foreign 73.0 91.5 74.1
Income from continuing operations before income taxes 468.2 410.5 467.9
Discontinued operations      
U.S. domestic 0.3 (1.1) 0.1
Foreign 0.0 0.0 0.0
Total pre-tax income (loss) from discontinued operations 0.3 (1.1) 0.1
Total pre-tax income 468.5 409.4 468.0
Current expense      
Federal and State 133.0 155.5 140.1
Foreign 28.4 29.2 24.0
Total current expense 161.4 184.7 164.1
Deferred expense (benefit)      
Federal and State (64.7) (15.5) (12.7)
Foreign 6.2 (9.5) (3.1)
Total deferred expense (benefit) (58.5) (25.0) (15.8)
Provision for income taxes 102.9 159.7 148.3
Reconciliation of taxes from continuing operations      
Taxes at the 35% U.S. statutory rate 163.9 143.7 163.8
State and local taxes, net of federal income tax benefit 10.8 8.6 1.9
Benefit of foreign earnings taxed at lower rates (6.7) (8.1) (7.9)
Benefit for domestic manufacturing deduction (10.4) (12.6) (11.5)
Tax credits (2.3) (10.7) 0.0
Tax impact of impairment of goodwill 0.0 41.2 0.0
Impact of U.S. tax reform (57.7) 0.0 0.0
Change in investment assertion on foreign earnings 5.1 0.0 0.0
Other, net 0.2 (2.4) 2.0
Total tax expense $ 102.9 $ 159.7 $ 148.3
Effective income tax rate on continuing operations (as a percent) 22.00% 38.90% 31.70%
Income Taxes Paid, Net [Abstract]      
Cash payments for income taxes, net of refunds $ 142.8 $ 192.3 $ 123.0