Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity-based compensation [Abstract]
Equity-based compensation expense	$ 40.7	$ 43.7	$ 39.2
Income tax benefit	(9.9)	(15.3)	(13.3)
Equity-based compensation expense (net of tax)	30.8	$ 28.4	25.9
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Compensation cost not yet recognized	$ 36.0
Compensation cost not yet recognized, period for recognition	1 year 8 months 12 days
Stock option contractual life	10 years
Number of Options (in shares):
Options outstanding, beginning (in shares)	4,457,996
Granted (in shares)	1,021,398
Forfeitures/Expired (in shares)	(63,372)
Exercised (in shares)	(935,250)
Options outstanding, ending (in shares)	4,480,772	4,457,996
Options Weighted Average Exercise Price (in dollars per share):
Options outstanding, beginning weighted-average exercise price (in dollars per share)	$ 37.41
Grants, weighted average exercise price (in dollars per share)	73.85
Forfeitures and Expirations, weighted average exercise price (in dollars per share)	59.85
Exercises, weighted average exercise price (in dollars per share)	30.59
Options outstanding, ending weighted-average exercise price (in dollars per share)	$ 46.82	$ 37.41
Options, Additional Disclosures:
Options, exercisable (in shares)	2,423,693
Options, vested and expected to vest, Outstanding (in shares)	2,031,401
Options, exercisable, weighted average exercise price (in dollars per share)	$ 32.67
Options, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 63.43
Options, outstanding, weighted average remaining contractual term	7 years 14 days
Options, exercisable, weighted average remaining contractual term (years)	5 years 9 months 14 days
Options, vested and expected to vest, outstanding, weighted average remaining contractual term (in years)	8 years 6 months 7 days
Options, outstanding intrinsic value	$ 153.5
Options, exercisable, Intrinsic Value	117.3
Options, vested and expected to vest, aggregate intrinsic value	35.9
Total intrinsic value of stock options exercised	$ 47.0	$ 17.0	$ 7.0
Award vesting period	3 years
Employee Stock Option
Fair Value Assumptions:
Grant date fair value (in dollars per share)	$ 14.80	$ 12.27	$ 8.55
Volatility (as percent)	20.00%	22.00%	25.00%
Risk-free rate (as percent)	2.75%	2.08%	1.47%
Expected dividend yield (as percent)	1.14%	1.09%	1.08%
Expected term (in years)	6 years	6 years	6 years
Restricted Stock Units (RSUs)
Options, Additional Disclosures:
Award vesting period	4 years
Number of Units (in shares):
Nonvested beginning of period (in shares)	131,069
Grants (in shares)	177,525
Vested (in shares)	(26,886)
Forfeited (in shares)	(21,535)
Nonvested end of period (in shares)	260,173	131,069
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Beginning nonvested, weighted average grant date fair value (in dollars per share)	$ 40.11
Granted, weighted average grant date fair value (in dollars per share)	73.95	$ 58.90	$ 39.82
Vested, weighted average grant date fair value (in dollars per share	60.18
Forfeited, weighted average grant date fair value (in dollars per share	60.25
Ending nonvested, weighted average grant date fair value (in dollars per share)	$ 59.56	$ 40.11
Vested in period, fair value (less than)	$ 2.0	$ 18.0	$ 1.0
Performance Share Units (PSUs)
Options, Additional Disclosures:
Award vesting period	3 years
Number of Units (in shares):
Nonvested beginning of period (in shares)	418,973
Grants (in shares)	204,890
Attainment Adjustment (in shares)	154,234
Vested (in shares)	(334,255)
Forfeited (in shares)	(22,005)
Nonvested end of period (in shares)	421,837	418,973
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Beginning nonvested, weighted average grant date fair value (in dollars per share)	$ 50.75
Granted, weighted average grant date fair value (in dollars per share)	73.74	$ 59.00	$ 39.91
Attainment Adjustment, weighted average grant date fair value (in dollars per share)	37.84
Vested, weighted average grant date fair value (in dollars per share	39.92
Forfeited, weighted average grant date fair value (in dollars per share	59.87
Ending nonvested, weighted average grant date fair value (in dollars per share)	$ 65.85	$ 50.75
Vested in period, fair value (less than)	$ 13.0	$ 20.0	$ 9.0
Performance Share Awards (PSAs)
Options, Additional Disclosures:
Award vesting period	3 years
Number of Units (in shares):
Nonvested beginning of period (in shares)	122,467
Grants (in shares)	1,279
Attainment Adjustment (in shares)	111,565
Vested (in shares)	(227,298)
Forfeited (in shares)	(8,013)
Nonvested end of period (in shares)	0	122,467
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Beginning nonvested, weighted average grant date fair value (in dollars per share)	$ 40.08
Granted, weighted average grant date fair value (in dollars per share)	0	$ 0.00	$ 40.06
Attainment Adjustment, weighted average grant date fair value (in dollars per share)	37.79
Vested, weighted average grant date fair value (in dollars per share	40.12
Forfeited, weighted average grant date fair value (in dollars per share	39.79
Ending nonvested, weighted average grant date fair value (in dollars per share)	$ 0	$ 40.08
Vested in period, fair value (less than)	$ 9.0	$ 5.0	$ 0.0
Minimum | Performance Share Units (PSUs)
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Potential vesting percentage range of shares	0.00%
Minimum | Performance Share Awards (PSAs)
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Potential vesting percentage range of shares	0.00%
Maximum | Performance Share Units (PSUs)
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Potential vesting percentage range of shares	200.00%
Maximum | Performance Share Awards (PSAs)
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Potential vesting percentage range of shares	200.00%
2013 Long Term Incentive Plan
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Number of shares authorized (in shares)	15,500,000
Number of share available for grant (in shares)	4,978,336
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Options nonvested number of shares (in shares)	3,798,508